FAU MoD Lecture: Applications of AAA Rational Approximation

Date: Wed. February 1, 2023
Event: FAU MoD Lecture
Organized by: FAU MoD, Research Center for Mathematics of Data at Friedrich-Alexander-Universität Erlangen-Nürnberg (Germany)

Speaker: Prof. Dr. Nick Trefethen
Affiliation: University of Oxford

This FAU MoD Lecture will have two sessions:

[Session 1] Main lecture (10:30H – 11:30H)
Title: Applications of AAA Rational Approximation
(On-site / online)

Abstract. For the first time, a method has recently become available for fast computation of near-best rational approximations on arbitrary sets in the real line or complex plane: the AAA algorithm (Nakatsukasa-Sete-T. 2018). We will present the algorithm and then demonstrate a number of applications, including
• detection of singularities
• model order reduction
• analytic continuation
• functions of matrices
• nonlinear eigenvalue problems
• interpolation of equispaced data
• smooth extension of multivariate real functions
• extrapolation of ODE and PDE solutions into the complex plane
• solution of Laplace problems
• conformal mapping
• Wiener-Hopf factorization
(joint work with Stefano Costa and others)

[Session 2] A Tour of Chebfun (16:30H – 17:30H)
By Prof. Dr. Nick Trefethen

This session will be a hands-on introduction to Chebfun, and it should be of interest to anyone who uses MATLAB. Chebfun starts from the idea of continuous analogues of Matlab operations: vectors are overloaded to functions and matrices to operators. The result is an appealing tool for all kinds of problems of rootfinding, quadrature, optimization, and ODEs.

If you wish to play along, bring your laptop and download the software in advance from www.chebfun.org or https://github.com/chebfun/chebfun/.


This is a hybrid event (On-site / online), open to the public specially students, researchers, academics and scientific community all around the world.
You can join us:

Room 04.363 Seminarraum Mathematik. Department Mathematik.
Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Cauerstrasse 11, 91058 Erlangen

Zoom meeting link
Meeting ID: 694 3141 3515 | PIN: 730757


Poster of the event
This event on LinkedIn


You might like:
New Algorithms in MATLAB. Invitation to FAU MoD Lecture by Prof. Dr. Nick Trefethen at the Faculty of Sciences at FAU (English version)
Neue Algorithmen in MATLAB. Einladung zu Fachvorträgen von Prof. Dr. Nick Trefethen am 1. Februar 2023 (German version)
• FAU MoD Lecture: Learning-Based Optimization and PDE Control in User-Assignable Finite Time by Prof. Dr. Miroslav Krstic

// Photo of Prof. Trefethen by Sarah Bird

The event is finished.


Wed. Feb 01, 2023


10:30 - 17:30

More Info

Zoom meeting link


DDS, Friedrich-Alexander-Universität Erlangen-Nürnberg
DDS, Friedrich-Alexander-Universität Erlangen-Nürnberg